Regulation of furnaces.



l a @am PATENTHD MAY 1, 190s.

IIL

J. c. QUINN. REGULATION of PURNAGES;

L *r -vflnL-DT'lnl a Humm' niuumwN LPPLIUATIOK FILED AUGS, 1904.

zen of the lfnited States. residing in the borv damper has applied to it a lever-arm q, pro- UNITED STATES JOHN t'. QUINN, 0F' NEW YORK, N.

PATENT o-EEICE.

Y.. Assimfwrv fEsE .assimil MENTS, TO THE ENGINEER COMPANY, A CUHPORATION 0F NE'VV I YOR K.

No. 819,672. f

To (1f/ rtf/1,0111, it may concern:

Be it known that I,Jon.\ QUNN, a citiough of Brooklyn, city of New York, State of New York, have invented certain newand l useful Improvements in Regulation ot Furnaces, of which the following is a specification.

A primary object of this invention is autot matically to maintain in the fire-chamber of a forced-draft furnace a uniform or substan- I tially uniform pressure that may be equal or substantially equal to that ofthe atmosphere t of the furnace-room or such other snbstanl tiallv uniform pressure as may be desired. The purpose is to obtain maximum elli-i ciency, economy or fuel consumption, and l minimum liability of injury to the furnace f or associated parts by inrush of cold air when 3' the door of the fire-box is opened. In the accompanying drawings, Figure l is 3 a vertical longitudinal `section indicating a i steam-boiler f urnace to which this invention is applied. Fig. 2 is a detail `sectional view, on a large scale. of a diaphragm-motor; and Fig. 3 is a detail elevation. partly in section, showing,r a modification.

a indicates a draft-blower driven by an enlne b, supplied by steam direct from the oiler through a pipe-connection c, which contains two steam-cocks tl e, a steam-regulating valvef, located between them, and a steam-gage g. beyond which the steam-pipe asses to the engine b, of which h is the exaust. A by-pass pipe connection i, containin a valve or steam-cock lr, is connected aroun the parts d cfg. Air from the blower asses through duct m into the ash-pit n. he products of combustion pass out through flue o, in which is located the damper p. (Shown by dotted lines.) The axis of the vided with an adjustable weight 1' on one side of the axis. and having its end on the opposite side operatively connected with a vertically-movable rod s. attached to a. dampermotor t. This motor man be of the expansible and collapsible diaphragm type, as indicated in Fig. 2. or of the water-seal type, as indicated in Fig. 3, and in either case it is connected on its opposite side by' a pipe or Specification of Letters Patent.

Lunlicaton tiled August 3, 1904. Serial No. 219532.

passage 11. of sutlicient cross-sectional area with the interior of the fire-box, preferably :atenten may 1, 190e.

l 'under the boiler-tubes and above the line of the fuel lying noon the Trate. c is the door of the fire-box, and -v' is the door of the ash-pit. The play of the loverarm g, that operates the. stackdamper, may

be limited by pins adjnstably placed in au apertured bloei: or frame w and against 6o which the arm plays.

The steam-cocks d e may be used to throttle. tne steam: but primarily they are intended for closing tlc passage when Inspection or repair of the regulating-valvef is required. 'lhe ily-pass ri may permit at all times a minimum amount :ai steam to be passed to the engine b, or the .steam-cock r may after the parts are in operation be completely closed. The steam-regulating valvefs of such char- 7o actei that the amount of steam that passes it is determined by the pressure of the steam.

' The speed of the blower will therefore be controlled relatively to the boiler-pressure, vso that at all times the desired volume and pressure of air will be delivered to the furnace.

In order to regulate or control the ressure within the fire-box above the fuel, t e present invention contemplates that the discharge of the products oi' combustion from 8o the furnace shall be controlled by the pressure within the fire-box. vIn the present instance this moe of control is shown as accomplished by controlling the damper in the stack correspondingly with variations o ressure in the fire-box. The invention, lowever, is not in its broadest aspect limited to this particular mode of control nor to the s iecial t paratus illustrated and described. hus if t e fire-box pressure rises above the 9o desired normal the rod s is raised and the damper correspondingly opens, and vice versa, the movements of the damper being graduated and bearing a relation to the variations of presure in the fire-box. To afford adjustment. the rod s may be composed of two arts united by a reversely-threaded adjusta le coupling or sleeve t'. (Shown in Fig. 2.) In this Way, the various parts of the apparatus beingr properly proportioned or la: related to each other, a substantially uniform )fessure and auch pressure as is desired may maintained in the lire-box.

I claim as mv invention- 1. The combination with a steam-boiler and its furnace, of means governed by the steam-pressure in said boiler for positively supplying,r airfto the said furnace relatively to the steam-pressure, a damper and moans governed b v the ressure of the furnace-gases for 5 controlling t e damper tol maintain a substantially constant predetermined pressure in said furnace.

2. The combination with a steam-boiler and its furnace, of means voverned by the 1o steam-pressure in said boiler for positively supplying air to said furnace relatively to the steam-pressure, and means governed by the iressure in the furnace for maintaining a substantially constant predetermined pres- 15 sure in said furnace.

3. The combination with a steam-boiler and its furnace, of means governed by the steampressure in said boiler for positively supplying air to said furnace relatively to the zo steam-pressure, a damper and means for con- 4. The combination with a steam-boiler and its furnace, of means nroverned by the steam-pressure in said boiler for positively supplying air to said furnace, relatively to the steam-pressure. and means actuated bv aria-tions or pmsuie vritiun Vtue fornaci u control the discharge of products of combustion and thereby maintain a substantially uniform pressure within the furnace.

5. The combination with a furnace, and a. steam-boiler, of a blower for supplying air to the. furnaci` govemed by the pressure of steam within the boiler, and a damper controlling the exit of gases from the furnace, said damper being governed -by the pressure of the furnace-gases. l

In testimony whereof I have hereunto subscribed my name.

JOHN C. QUINN.

Witnesses:

E. F. PORTER, EDWARD C. DAVIDSON. 

